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# Copyright 2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library.  If not, see <http://www.gnu.org/licenses/>.

# Migration of pado-delay options

from vyos.configtree import ConfigTree

base = ['service', 'pppoe-server', 'pado-delay']

def migrate(config: ConfigTree) -> None:
    if not config.exists(base):
        return

    pado_delay = {}
    for delay in config.list_nodes(base):
        sessions = config.return_value(base + [delay, 'sessions'])
        pado_delay[delay] = sessions

    # need to define delay for latest sessions
    sorted_delays = dict(sorted(pado_delay.items(), key=lambda k_v: int(k_v[1])))
    last_delay = list(sorted_delays)[-1]

    # Rename last delay -> disable
    tmp = base + [last_delay]
    if config.exists(tmp):
        config.rename(tmp, 'disable')